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A kind of treatment method of unsaturated polyester waste water

A treatment method, polyester wastewater technology, applied in the field of unsaturated polyester wastewater treatment, can solve the problems of increased wastewater treatment operating costs, changes in sludge properties, uneconomical and practical, etc., to achieve good economic and environmental benefits, process Short, low energy cost effect

Active Publication Date: 2017-03-22
SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for such unsaturated polyester wastewater with single composition and high concentration of organic matter, it is far from enough to use biochemical treatment to supplement nitrogen, phosphorus and inorganic salts by mixing domestic sewage, and additional artificial dosing It is not comprehensive enough, and it will also increase the operating cost of wastewater treatment, which is not economical and practical
In addition, if the biological treatment system lacks certain substances for a long time, it will lead to changes in the properties of the sludge, causing a series of operational problems such as viscous expansion and poor impact resistance.

Method used

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  • A kind of treatment method of unsaturated polyester waste water

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Effect test

Embodiment 1

[0024] The treatment method of the invention is used to treat the unsaturated polyester resin wastewater produced in the polycondensation stage. The content of organic matter in polyester wastewater is about 15 wt%, of which the content of dihydric alcohol is about 11.2~11.8 wt%, the content of phthalic anhydride and maleic anhydride is 2.5~2.7 wt%, and other light organic matter is 0.3~1.2 wt% (The following examples and comparative examples adopt the same polyester waste water). The unsaturated polyester waste water is firstly treated by rectification. The primary condenser is a stainless steel condensing tower with a processing capacity of 10L / h. It is equipped with a condensing plate and a reflux system. The tower is filled with PVC packing. The rectification condition is the temperature inside the tower. 100±2°C, the temperature of the condensate at the top of the tower is 80°C, the batch processing is 10L / time, the residence time is 1h, and the liquid phase reflux ratio ...

Embodiment 2

[0026] The treatment method of the invention is used to treat the unsaturated polyester resin wastewater produced in the polycondensation stage. The unsaturated polyester waste water is firstly treated by rectification. The primary condenser is a stainless steel condensing tower with a processing capacity of 10L / h. It is equipped with a condensing plate and a reflux system. The tower is filled with PVC packing. The rectification condition is the temperature inside the tower. 100±2°C, the temperature of the condensate at the top of the tower is 75°C, the batch processing is 10 L / time, the residence time is 1.5h, and the liquid phase reflux ratio is 5:1. Dosing NaOH and Na in the treated effluent 2 CO 3Adjust the pH value of the wastewater to 6.0, the mass ratio of the two is 5:1, and add 50g of feces per L of wastewater to supplement nitrogen and phosphorus (that is, COD:N:P is about 70:5:1). After fully mixing, the wastewater enters the high-temperature anaerobic treatment. ...

Embodiment 3

[0028] On the basis of Example 2, ammonium chloride and potassium dihydrogen phosphate were added according to COD:N:P=70:5:1 to supplement N and P nutrient salts. Other treatment conditions were the same as in Example 2, and the COD of the effluent was measured. 196 mg / L, BOD 5 It was 88.6 mg / L, ammonia nitrogen was 18.5 mg / L, and volatile phenol was 5.7 mg / L.

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Abstract

The invention discloses a processing method of unsaturated polyester waste water. The processing method comprises following steps: (1) unsaturated polyester waste water is subjected to rectification, concentration recovery of materials with a high boiling point is realized, and materials with a low boiling point are subjected to condensation so as to obtain organic waste water; (2) pH value of the organic waste water obtained via condensation is adjusted to 5.0 to 6.5, and supplement of nutrient substances is carried out; (3) the organic waste water obtained in step (2) is subjected to high-temperature anaerobic treatment at a temperature of 55 to 60 DEG C; and (4) after anaerobic treatment, the waste water is subjected to aerobic treatment, and up-to-standard release can be realized after treatment. The processing method is capable of avoiding pollution caused by the unsaturated polyester waste water completely, and realizing harmless treatment of the unsaturated polyester waste water; biochemical treatment effect is excellent; biochemical treatment system operation is stable; organic material recovery rate is high; wastes are used for treatment of wastes; land occupation is small; the processing method is low in cost; operation is stable; and up-to-standard release of processed water can be realized.

Description

technical field [0001] The invention relates to a treatment method of unsaturated polyester wastewater, in particular to the treatment of polyester wastewater produced in the polycondensation reaction stage in the production process of unsaturated polyester resin (UPR). Background technique [0002] Unsaturated polyester resin (UPR) is produced by chemical polycondensation reaction of dibasic acid and dibasic alcohol. High-concentration unsaturated polyester wastewater is mainly generated water in the polycondensation reaction of alcohol anhydride, and the organic matter content is as high as about 15 wt%, mainly for reaction materials such as ethylene glycol, propylene glycol, diethylene glycol, phthalic anhydride, maleic anhydride, and intermediate products such as some low-molecular polyester monomers. [0003] Early polyester enterprises mostly used the method of heat medium furnace incineration to treat polyester vapor, but because the system pressure is not easy to bal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/38
Inventor 张蕾郭宏山李宝忠许莹朱卫
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD